Just finished 0.8's story, and I gotta say, this is one of the best VNs that I've seen in a LONG time. That said, I do think some things need to be clarified. The plan to go against Minato is supposed to require 50k yen and is first brought up VERY early. I assumed you would be able to start it at any time once you met that goal. This isn't true of course, so you should probably at least tell the player that they have to wait for whatever reason to encourage them to actually progress the main story.